They prey on the innocent and the unarmed…..
Check it out:

On October 9, the Crime Prevention Research Center (CPRC) released a revised report showing that 92% of mass public shootings between January 2009 and July 2014 took place in gun-free zones.

The CPRC report was released in response to an Everytown for Gun Safety study claiming only 14% of mass public shootings took place in gun-free zones. Everytown actually claimed 86% of such incidents occurred in places where guns were allowed.